This white paper explains why building control systems are increasingly exposed to cyber threats as OT and IT networks converge. It argues that cybersecurity must be embedded into product design rather than added after deployment. The document introduces ISA/IEC 62443 as the leading international standard for securing industrial and building control systems across the full product lifecycle. It details how secure development lifecycles, independent certification, and process audits—such as ISA/IEC 62443-4-1—provide transparency, reduce risk, and build trust for system integrators, owners, and operators of critical infrastructure and smart buildings.

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